Things are not really as they seem...

Things are not really as they seem...

An old lady would cross from Brazil's border to Paraguay in the Friendship Bridge by bike, only taking with her a bag full of sand.
Following the usual, the border inspector checked her and the bag, and seeing nothing illegal, he let her pass.
She crossed the bridge everyday for about 1 year, until the inspector gave up to his curiosity and finally asked :

" Excuse me Mrs., i can't take it anymore. Everyday you pass through here with this bag, with nothing but sand inside it, please, i swear i won't fine you if you tell me what you do there."

Not trusting him at first, the old lady replied :

"Are you sure you're not going to fine me?"

The inspector, already bursting in curiosity eagerly, quickly answered :

"Yes, but please tell me already!"

The old lady, with a giggle in her face said :

"I get a new bike everyday."